/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.activemq.store;

import java.io.IOException;

import org.apache.activemq.broker.ConnectionContext;
import org.apache.activemq.command.ActiveMQDestination;
import org.apache.activemq.command.Message;
import org.apache.activemq.command.MessageAck;
import org.apache.activemq.command.MessageId;
import org.apache.activemq.usage.MemoryUsage;

abstract public class AbstractMessageStore implements MessageStore {
    public static final ListenableFuture<Object> FUTURE;
    protected final ActiveMQDestination destination;
    protected boolean prioritizedMessages;
    protected IndexListener indexListener;
    protected final MessageStoreStatistics messageStoreStatistics = new MessageStoreStatistics();

    public AbstractMessageStore(ActiveMQDestination destination) {
        this.destination = destination;
    }

    @Override
    public void dispose(ConnectionContext context) {
    }

    @Override
    public void start() throws Exception {
        recoverMessageStoreStatistics();
    }

    @Override
    public void stop() throws Exception {
    }

    @Override
    public ActiveMQDestination getDestination() {
        return destination;
    }

    @Override
    public void setMemoryUsage(MemoryUsage memoryUsage) {
    }

    @Override
    public void setBatch(MessageId messageId) throws IOException, Exception {
    }

    /**
     * flag to indicate if the store is empty
     *
     * @return true if the message count is 0
     * @throws Exception
     */
    @Override
    public boolean isEmpty() throws Exception {
        return getMessageCount() == 0;
    }

    @Override
    public void setPrioritizedMessages(boolean prioritizedMessages) {
        this.prioritizedMessages = prioritizedMessages;
    }

    @Override
    public boolean isPrioritizedMessages() {
        return this.prioritizedMessages;
    }

    @Override
    public void addMessage(final ConnectionContext context, final Message message, final boolean canOptimizeHint) throws IOException{
        addMessage(context, message);
    }

    @Override
    public ListenableFuture<Object> asyncAddQueueMessage(final ConnectionContext context, final Message message) throws IOException {
        addMessage(context, message);
        return FUTURE;
    }

    @Override
    public ListenableFuture<Object> asyncAddQueueMessage(final ConnectionContext context, final Message message, final boolean canOptimizeHint) throws IOException {
        addMessage(context, message, canOptimizeHint);
        return FUTURE;
    }

    @Override
    public ListenableFuture<Object> asyncAddTopicMessage(final ConnectionContext context, final Message message, final boolean canOptimizeHint) throws IOException {
        addMessage(context, message, canOptimizeHint);
        return FUTURE;
    }

    @Override
    public ListenableFuture<Object> asyncAddTopicMessage(final ConnectionContext context, final Message message) throws IOException {
        addMessage(context, message);
        return new InlineListenableFuture();
    }

    @Override
    public void removeAsyncMessage(ConnectionContext context, MessageAck ack) throws IOException {
        removeMessage(context, ack);
    }

    @Override
    public void updateMessage(Message message) throws IOException {
        throw new IOException("update is not supported by: " + this);
    }

    @Override
    public void registerIndexListener(IndexListener indexListener) {
        this.indexListener = indexListener;
    }

    public IndexListener getIndexListener() {
        return indexListener;
    }

    static {
       FUTURE = new InlineListenableFuture();
    }

    @Override
    public int getMessageCount() throws IOException {
        return (int) getMessageStoreStatistics().getMessageCount().getCount();
    }

    @Override
    public long getMessageSize() throws IOException {
        return getMessageStoreStatistics().getMessageSize().getTotalSize();
    }

    @Override
    public MessageStoreStatistics getMessageStoreStatistics() {
        return messageStoreStatistics;
    }

    protected void recoverMessageStoreStatistics() throws IOException {

    }
}